Journal of Electroanalytical Chemistry, Vol.402, No.1-2, 19-28, 1996
Theory of Current Elimination in Linear Scan Voltammetry
The theory of the elimination of particular currents from the results of linear scan voltammetry has been developed with the aim of achieving an advantage for stationary electrodes similar to that obtained by elimination polarography. The necessary conditions for elimination are that (1) the total current is formed from the sum of particular currents and (2) the particular currents eliminated are expressed as the product of scan rate function and electrode potential function. Elimination occurs when total currents with different scan rates but the same electrode potential are brought together in linear combination. The necessary coefficients for linear combination are computed from the chosen scan rates and scan rate functions of the eliminated currents. Linear combinations for practical applications have two to four members and use scan rate ratios which are based on integer powers of 2 and 4. They can eliminate kinetic, charging and reversible currents, the foot of the irreversible current, the reversible current sphericity correction and the reversible current with totally adsorbed substances, The application of elimination can expand the electrode working potential range beyond the ordinary limit. It can also improve the resolution of the irreversible current up to that for the reversible current, differentiate irreversible from reversible currents and make a true baseline correction.
Keywords:POLAROGRAPHY